The Optimo 24-290 starts to work in 1.85 at 30mm but then begins to show a vignette as the zoom gets close to 290mm

Optimo 24-290 at 24mm Alexa XT Open Gate

Optimo 24-290 at 24mm Alexa XT Open Gate

Optimo 24-290 at 24mm on alexa XT Open Gate with 1.85 crop

Optimo 24-290 at 24mm on alexa XT Open Gate with 1.85 crop

Optimo 24-290 at 30mm on Alexa XT Open gate

Optimo 24-290 at 30mm on Alexa XT Open gate

Optimo 24-290 at 30mm on alexa XT Open gate with 1.85 crop

Optimo 24-290 at 30mm on Alexa XT Open gate with 1.85 crop

Optimo 24-290 at 55mm on Alexa XT Open Gate

Optimo 24-290 at 55mm on Alexa XT Open Gate

Optimo 24-290 at 55mm on alexa XT Open Gate with 1.85 crop

Optimo 24-290 at 55mm on alexa XT Open Gate with 1.85 crop

 

Optimo 24-290 at 290mm on Alexa XT Open gate

Optimo 24-290 at 290mm on Alexa XT Open gate

Optimo 24-290 at 290mm on Alexa XT Open Gate with 1.85 crop

Optimo 24-290 at 290mm on Alexa XT Open Gate with 1.85 crop